721-98-03990 Boom Cylinder Seal Kit for Komatsu PC500LC-10 Excavator

Premium 721-98-03990 Boom Cylinder Seal Kit for Komatsu Excavators

Eliminate hydraulic fluid leaks and restore the massive lifting capacity of your heavy-duty excavator with the WINSCHEN premium 721-98-03990 Boom Cylinder Seal Kit. Engineered to withstand the extreme operational pressures, heavy payloads, and abrasive environments of large-scale construction and earthmoving, this high-quality aftermarket repair kit ensures your Komatsu equipment operates safely and efficiently with zero pressure loss.

Key Features and Selling Points

• Manufactured to strict OEM dimensions, ensuring a precise and seamless fit for the boom hydraulic cylinders used in heavy-duty Komatsu PC500LC-10R and PC500LC-10M0 series excavators.
• Constructed from advanced elastomeric, polyurethane, and heavy-duty wear-resistant materials to provide exceptional resistance to high hydraulic pressure spikes, continuous rod friction, and extreme thermal variations.
• Effectively eliminates internal fluid bypass and external leakage, preventing boom drift and maintaining highly responsive, consistent lifting force for heavy loads.
• This comprehensive seal kit includes all essential precision components—such as O-rings, dust seals, backup rings, wear rings, piston rings, buffer rings, and rod packings—required for a complete and reliable cylinder overhaul.
• A cost-effective, highly reliable aftermarket alternative that meets or exceeds original equipment standards, minimizing your machine’s routine maintenance downtime and maximizing on-site productivity.

Compatible Equipment Models

Based on official catalog and parts cross-reference data, the 721-98-03990 seal kit services the boom cylinders of the following Komatsu equipment:

• Crawler Excavators: PC500LC-10R, PC500LC-10M0
• Application: Boom Cylinder Hydraulic Service / Rebuild

Specifications

To guarantee 100% fitment, please verify your machine’s model, serial number, and original cylinder configuration with our dedicated support team prior to purchasing. We proudly offer fast and reliable global shipping to keep your heavy-duty projects on schedule.